R21xx-HP FlexFabric 11900 Security Configuration Guide
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Configuration guidelines
• Make sure at least one static IP source guard binding entry or DHCP snooping entry is available for
user validity check. Otherwise, ARP packets received from ARP untrusted ports are discarded.
• You must specify a VLAN for an IP source guard binding entry. Otherwise, no ARP packets can
match the IP source guard binding entry.
Configuration procedure
To configure user validity check:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter VLAN view.
vlan vlan-id N/A
3. Enable ARP detection.
arp detection enable By default, ARP detection is disabled.
4. Return to system view.
quit N/A
5. Enter Layer-2 Ethernet interface
view or Layer-2 aggregate
interface view.
interface interface-type
interface-number
N/A
6. (Optional.) Configure the
interface as a trusted interface
excluded from ARP detection.
arp detection trust By default, an interface is untrusted.
Configuring ARP packet validity check
Enable validity check for ARP packets received on untrusted ports and specify the following objects to be
checked:
• src-mac—Checks whether the sender MAC address in the message body is identical to the source
MAC address in the Ethernet header. If they are identical, the packet is forwarded. Otherwise, the
packet is discarded.
• dst-mac—Checks the target MAC address of ARP replies. If the target MAC address is all-zero,
all-one, or inconsistent with the destination MAC address in the Ethernet header, the packet is
considered invalid and discarded.
• ip—Checks the sender and target IP addresses of ARP replies, and the sender IP address of ARP
requests. All-zero, all-one, or multicast IP addresses are considered invalid and the corresponding
packets are discarded.
To configure ARP packet validity check:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter VLAN view.
vlan vlan-id N/A
3. Enable ARP detection.
arp detection enable By default, ARP detection is disabled.
4. Return to system view.
quit N/A
5. Enable ARP packet validity check
and specify the objects to be
checked.
arp detection validate
{ dst-mac | ip | src-mac }
*
By default, ARP packet validity check
is disabled.